Gotz, D., Zhou, and M.X.
  <b>Characterizing users' visual analytic activity for insight
  provenance</b>.
  In <i>Proceedings of VAST 2008</i>, 2008.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Gotz-2008-CUV.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Gotz-2008-CUV.bib">(bibtex:
  Gotz-2008-CUV)</A>.<br />